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[Xen-devel] Found memory leak in libxenstore



Hi,

I found this memory leak on xen-4.5.0:

linux-byXjTX:~ # virsh version

Compiled against library: libvirt 1.2.17

Using library: libvirt 1.2.17

Using API: Xen 1.2.17

Running hypervisor: Xen 4.5.0

 

Steps to produce this leak:

1.       Start a vm, win7_64_2U_vhd, for example.

2.       Stop libvirtd and start it with valgrind, using the following command:

valgrind --tool=memcheck --log-file=xs.log --leak-check=full --show-reachable=yes --track-origins=yes --trace-children=yes --verbose libvirtd -d –l

3.       Wait until libvirtd started, then reboot the vm:

virsh reboot win7_64_2U_vhd

4.       After vm restarted, kill valgind with signal 3:

kill -3 27483 (27483 is the pid of valgrind)

5.       Open xs.log, search ‘definitely’, we will always find this leak:

==28989== 40 bytes in 1 blocks are definitely lost in loss record 327 of 585

==28989==    at 0x4C27B9B: malloc (vg_replace_malloc.c:263)

==28989==    by 0x7EBD618: read_message (xs.c:1146)

==28989==    by 0x7EBE8C6: read_thread (xs.c:1222)

==28989==    by 0x74F8805: start_thread (in /lib64/libpthread-2.11.3.so)

==28989==    by 0x77EC66C: clone (in /lib64/libc-2.11.3.so)

 

When we reboot vm twice, this leak would happen twice either. Could anyone verify this and fix it?

 

VM XML config attached here, just for reference:

<domain type='xen'>

   <name>win7_64_2U_vhd</name>

   <memory>2097152</memory>

   <currentMemory>2097152</currentMemory>

   <vcpu>2</vcpu>

   <hotplug vcpu='disable'/>

   <on_poweroff>destroy</on_poweroff>

   <on_reboot>restart</on_reboot>

   <on_crash>destroy</on_crash>

   <viridian>1</viridian>

   <rtc_timeoffset>3600</rtc_timeoffset>

   <clock offset='utc'/>

   <keymap>en-us</keymap>

  <os>

   <type>hvm</type>

   <loader>/usr/lib/xen/boot/hvmloader</loader>

   <boot dev='hd'/>

  </os>

  <devices>

    <emulator>/usr/lib/xen/bin/qemu-system-i386 </emulator>

    <disk type='file' device='disk'>

      <driver name='file'/>

      <source file='/sdb/sgd/win7_64_2U_vhd'/>

      <target dev='xvda' bus='xen'/>

    </disk>

    <disk type='file' device='cdrom'>

     <driver name='file'/>

     <source file='/usr/bin/pvdriver_upgrade/null.iso'/>

     <target dev='xvdd'/>

     <readonly/>

    </disk>

    <graphics type='vnc' listen='0.0.0.0'/>

    <video>

      <model type='cirrus' vram='8092'/>

    </video>

</devices>

</domain>

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